body{
    overflow-x:hidden;
    position: relative;
}
.navbar{ /*导航条样式*/
    width: 100%;
    height: 80px;
    background-color: white;
    margin: 0;
    border: 0;
    -moz-border-radius: 0;
    -webkit-border-radius: 0;
    border-radius: 0;
    position: fixed;
    z-index: 1;
}
.nav>li{
    margin-top: 15px;
    font-size: 15px;
}
.navbar-brand>img{
    position: relative;
    width: 150px;
    bottom: 10px;
    margin-top: 10px;
    margin-left: 100px;
}
form>input{
    height: 30px;
    border-radius: 30px;
    padding: 10px 20px;
    margin-top: 10px;
    color: #a8a8a8;
    border: 1px solid black;
}
form>button{
    background-color: rgba(255,255,255,0);/*透明*/
    border: 0;
    color: #a8a8a8;
    /*移动到文本框里面*/
    position: relative;
    right: 40px;
}
